Perhaps you should try some spelling variations:
mari belajar » hasil belajar
seri belajar » teori belajar, cara belajar
sosial dini » sosial edisi, sosial dan, sosial di
dan strata » dan surat, dan strategi
anak serat » anak sehat, anak surat, aneka serat
serat usi » serat aji
usi dini » usia dini, usai dini

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( mari belajar dan strata sosial dini ) or ( seri belajar anak serat usi dini ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( mari belajar dan strata sosial dini ) OR ( seri belajar anak serat usi dini )).
• Adding a wildcard symbol may retrieve word variants: (( mari belajar dan strata sosial dini ) or ( seri belajar anak serat usi dini ))*.